def inv_gcd(a,b):
    a=a%b
    if a==0:
        return (b,0)
    s=b;t=a
    m0=0;m1=1
    while(t):
        u=s//t
        s-=t*u
        m0-=m1*u
        s,t=t,s
        m0,m1=m1,m0
    if m0<0:
        m0+=b//s
    return (s,m0)
def inv_mod(x,m):
    assert 1<=m
    z=inv_gcd(x,m)
    assert z[0]==1
    return z[1]
def crt(r,m):
    assert len(r)==len(m)
    n=len(r)
    r0=0;m0=1
    for i in range(n):
        assert 1<=m[i]
        r1=r[i]%m[i]
        m1=m[i]
        if m0<m1:
            r0,r1=r1,r0
            m0,m1=m1,m0
        if (m0%m1==0):
            if (r0%m1!=r1):
                return (0,0)
            continue
        g,im=inv_gcd(m0,m1)
        u1=m1//g
        if ((r1-r0)%g):
            return (0,0)
        x=(r1-r0)//g % u1*im%u1
        r0+=x*m0
        m0*=u1
        if r0<0:
            r0+=m0
    return (r0,m0)

def floor_sum(n,m,a,b):
    ans=0
    if a>=m:
        ans+=(n-1)*n*(a//m)//2
        a%=m
    if b>=m:
        ans+=n*(b//m)
        b%=m
    y_max=(a*n+b)//m
    x_max=(y_max*m-b)
    if y_max==0:
        return ans
    ans+=(n-(x_max+a-1)//a)*y_max
    ans+=floor_sum(y_max,a,m,(a-x_max%a)%a)
    return ans

N = int(input())
R = []
M = []
for i in range(N):
    x, y = map(int, input().split())
    R.append(x)
    M.append(y)
ans = crt(R, M)
MOD = 10 ** 9 + 7
if ans == (0, 0):
    print(-1)
elif ans[0] == 0:
    print(ans[1] % MOD)
else:
    print(ans[0] % MOD)